John Muir, the founder of the Sierra Club and regarded by many as the Father of America's National Parks, had a love for technological invention. John Muir was a practical man; his work to protect and preserve the natural wilderness was not motivated by abstract idealism. He knew that the wilderness experience holds real intrinsic value worth preserving. When a person spends time in a pristine wilderness environment his, or her, mind and body experience a renewal that cannot be found in any other way. This, John Muir believed, has real value and is something that should be preserved for present and future generations.
Annually, the U.S. Energy Information Agency (EIA) reports remaining tons of coal in the demonstrated reserve base (DRB), which is a subset of total coal resources that have been mapped to measured and indicated degrees of accuracy and found at depths and in coalbed thicknesses considered technologcially minable at the time of determination. As of January 1, 2008, the DRB was estimated to contain 489 billion short tons (a short ton is a unit of weight equal to 2,000 pounds). The U.S. uses just over a billion short tons of coal each year. As of January 1, 2008, U.S.A. DRB was estimated to contain 489 billion tons.